- 目录
- 混凝土与制品
- 首页
高强箍筋约束混凝土抗压强度尺寸效应及收缩特性
作者：贾立夫
（东北林业大学工程咨询设计研究院，黑龙江 哈尔滨 150040）
摘要：设计3种高强箍筋约束混凝土试件，以试件尺寸为变量，通过轴心受压试验分析试件抗压强度尺寸效应；对3个大尺寸高强箍筋约束混凝土柱试件在高轴力下实行长时间的性能测算试验，分析其收缩徐变特性。试验结果表明，试件尺寸增大时其峰值应力降低，说明试件尺寸越大其抗压强度越低；试件尺寸增大时其峰值、85%峰值应变、箍筋屈服时全截面应力同峰值应力比值均增长；混凝土试件的徐变应变随强度的提高而增大，随弹性模量的提高而减小，且高强箍筋约束混凝土柱收缩徐变预测模型对收缩徐变系数预测的准确性较高，模型修正后，收缩徐变特性的预测准确度得到了进一步提升。
关键词：高强箍筋；混凝土；抗压强度；尺寸效应；收缩特性；修正模型
中图分类号：TU528.01 文献标识码：A 文章编号：1001-702X（2020）10-0031-05
Dimension effect and shrinkage characteristics of high strength stirrup confined concrete compressive strength
JIA Lifu
（Engineering Consultation and Design Institute，Northeast Forestry University，Harbin 150040，China）
Abstract：Three kinds of high-strength stirrup confined concrete specimens are designed，taking the specimen size as the test variable，the axial compression test is carried out by means of axial loading，and the size effect of compressive strength is analyzed. The long-term performance measurement test is carried out for three large-size high-strength stirrup confined concrete columns under high axial force，and the shrinkage and creep characteristics are analyzed. The test results show that the peak stress decreases with the increase of specimen size，which means that the larger the specimen size，the lower the compressive strength is；the peak value，85% peak strain and the ratio of full section stress to peak stress increase with the increase of specimen size；the creep strain of concrete specimen increases with the increase of strength and decreases with the increase of elastic modulus，and the shrinkage and creep prediction model of concrete columns confined by high-strength stirrups is more accurate in predicting shrinkage and creep coefficients. After the model is modified，the prediction accuracy of shrinkage and creep characteristics is further improved.
Key words：high strength stirrup，concrete，compressive strength，size effect，shrinkage characteristics，correction model